JP2008203925A - Document editing device, program, and storage medium - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To determine the character color of a text according to an image included in a document. <P>SOLUTION: This document editing device is provided with a detection means for detecting the inter-pixel luminance difference of images in a document including an image and a text; an acquisition means for acquiring the initial values of the background color and the character color of the text; and a changing means for changing at least either the background color or the character color of the text from the initial value acquired by the acquisition means according to the inter-pixel luminance difference detected by the detection means. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a technique for editing a document.

  In a document including an image and text (character string), how the character color is determined affects the appearance, balance, or aesthetics of the document. For example, Patent Document 1 discloses a technique for determining a character color inserted into a template in an image editing apparatus using the template. Specifically, according to Patent Document 1, the character color is set to a complementary hue of the background color.

JP 2002-158860 A

However, in Patent Document 1, when determining the character color, an image arranged in the paper is not considered. For this reason, the character colors may become unbalanced in relation to images arranged on the same sheet.
In contrast, the present invention provides a technique for determining the text color (or background color) of text in accordance with an image included in a document.

In order to solve the above-described problems, the present invention provides a detection unit that detects a lightness difference between pixels of the image in a document including an image and text, and an acquisition unit that acquires initial values of the background color and the character color of the text. A document editing unit including: a changing unit configured to change at least one of a background color and a character color of the text from an initial value acquired by the acquiring unit in accordance with a brightness difference between pixels detected by the detecting unit. Providing the device.
According to this document editing apparatus, the character color or the background color is determined according to the brightness difference between pixels of the image.

In a preferred aspect, in the document editing apparatus, the document may include a plurality of images, and the detection unit may detect a brightness difference between pixels in an image having a minimum distance from the text among the plurality of images. .
According to this document editing apparatus, the character color or the background color is determined according to the brightness difference between pixels of the image having the smallest distance from the text.

In another preferred aspect, in the document editing apparatus, the document may include a plurality of images, and the detection unit may detect a brightness difference between pixels in an image having the largest area among the plurality of images.
According to this document editing apparatus, the character color or the background color is determined according to the brightness difference between pixels of the image having the largest area.

In still another preferred embodiment, the document editing apparatus is characterized in that the changing means has at least one of a background color and a text color of the text so that a brightness difference between the text, the background color and the text color is equal to the brightness difference between the pixels. Either one may be changed.
According to this document editing apparatus, the brightness difference between pixels in an image is equal to the brightness difference between a background color and a character color in text.

  In still another preferred aspect, in the document editing apparatus, the changing means may change a background color and a character color of the text.

According to another aspect of the present invention, there is provided a computer device for detecting a brightness difference between pixels of the image in a document including an image and text, obtaining an initial value of a background color and a character color of the text, and detecting the detected values. A program for executing a step of changing at least one of a background color and a character color of the text from the acquired initial value according to the brightness difference between the pixels is provided.
Furthermore, the present invention provides a storage medium storing the above program.
According to this program or storage medium, the character color or the background color is determined according to the brightness difference between pixels of the image.

1. Configuration FIG. 1 is a diagram showing a functional configuration of a document editing apparatus 100 according to an embodiment of the present invention. The document editing apparatus 100 has a function for editing a document and a function for supporting the editing of the document accompanying the function. The “document” refers to data including layout information indicating the arrangement of at least one object arranged in the layout area and the object in the layout area, or a result output according to the data. “Object” refers to data indicating at least one of text (character string) or image, or text or image indicated by the data. A “layout area” refers to a physical boundary of an output document. The layout area refers to, for example, one or a plurality of papers, one page, a plurality of continuous pages, or a part of a page on which a document is printed.

  The brightness difference detection unit 101 detects a brightness difference between pixels of an image in a document including an image and text. The “pixel brightness difference” refers to a difference between the maximum value and the minimum value of brightness in a certain image. The initial value acquisition unit 102 acquires initial values of the text background color and character color. The color changing unit 103 changes at least one of the text background color and the character color from the initial value according to the brightness difference between the pixels.

  FIG. 2 is a diagram illustrating a hardware configuration of the document editing apparatus 100. A CPU (Central Processing Unit) 110 is a control device that controls each component of the document editing apparatus 100. A ROM (Read Only Memory) 120 is a storage device that stores data and programs necessary for starting up the document editing apparatus 100. A RAM (Random Access Memory) 130 is a storage device that functions as a work area when the CPU 110 executes a program. An I / F (Interface) 140 is an interface for inputting / outputting data and control signals to / from various input / output devices and storage devices. An HDD (Hard Disk Drive) 150 is a storage device that stores various programs and data. With respect to this embodiment, the HDD 150 stores a document editing program for generating a golden dividing line. The keyboard / mouse 160 is an input device for the user to input instructions to the document editing apparatus 100. The display 170 is an output device that displays data contents or processing status. In the present embodiment, the display 170 displays objects, layout areas, and golden dividing lines. The network IF 180 is an interface for transmitting and receiving data to and from other devices connected via a network (not shown). For example, the document editing apparatus 100 can receive a document (more precisely, electronic data indicating the document) via the network and the network IF 180. CPU 110, ROM 120, RAM 130, and I / F 140 are connected via a bus 190. When the CPU 110 executes the document editing program, the document editing apparatus 100 has the functional configuration shown in FIG. The document editing apparatus 100 may be any apparatus as long as it includes the functional configuration shown in FIG. 1 and the hardware configuration shown in FIG. For example, the document editing apparatus 100 may be a so-called personal computer. Alternatively, the document editing apparatus 100 may be an image forming apparatus such as a printer having these functions.

2. Operation FIG. 3 is a flowchart showing the operation of the document editing apparatus 100. Prior to the flow of FIG. 3, the document editing apparatus 100 acquires a document to be processed (hereinafter referred to as “target document”). The target document may be read from a storage device inside the document editing apparatus 100 such as the HDD 150. Alternatively, the target document may be acquired from another device via a network (not shown) and the network IF 180. Alternatively, the target document may be input by the user operating the keyboard / mouse 160.

  FIG. 4 is a diagram illustrating a target document. Document D includes image I and text T (“Let's dive into the sea this summer”) as objects. The document D includes information indicating text background color and character color candidates. Here, the document D includes candidate colors for each hue of four hues of “white” as a background color and “brown”, “purple”, “green”, and “blue” as character color candidates.

  A description will be given with reference to FIG. 3 again. In step S100, the CPU 110 acquires initial values of the character color and the background color. Since the document D includes information indicating text background color and character color candidates, the CPU 110 extracts character color and background color information from the document D data. Note that the CPU 110 may acquire initial values of the character color and the background color from the template relating to the color scheme. In this case, the HDD 150 stores at least one template. Alternatively, the initial values of the character color and the background color may be determined based on a user operation input.

  FIG. 5 is a diagram illustrating character color candidates. In the example of FIG. 5, one candidate color is shown for each hue with respect to four hues of “brown”, “purple”, “green”, and “blue”. In FIG. 5, the candidate colors are represented by two representations of RGB color system and L * a * b * color system. When stored as template or document data, the color-related information is stored as data according to the RGB color system. However, when performing processing related to the present embodiment, the candidate color component is L * a *. It is converted into data according to the b * color system. Note that if the candidate color is represented in the L * a * b * color system in the original data, conversion is not necessary. In the following description of the present embodiment, the lightness L * of the L * a * b * color system is used as an index “lightness” representing the brightness of a pixel in the claims and drawings.

This will be described with reference to FIG. 3 again. In step S110, the CPU 110 detects a brightness difference between pixels in an image included in the target document. The lightness difference between pixels is detected using a known algorithm for detecting the maximum value and the minimum value from the data group. Now, for example, when the minimum value L * _min of the lightness L * in the image to be processed (hereinafter referred to as “target image”) is 50 and the maximum value L * _max is 96, that is, the lightness difference ΔL * between pixels. = 46 will be described as an example.

In step S120, the CPU 110 changes at least one of the character color and the background color based on the brightness difference between the pixels. That is, the CPU 110 corrects at least one of the character color and the background color based on the brightness difference between pixels. Specifically, the CPU 110 determines a character color as follows, for example. The CPU 110 determines whether the lightness L * _{bak of the} background color (average value of lightness when the background color is composed of a plurality of colors) is equal to or greater than a threshold value. As the threshold value, for example, the median value (50) of the brightness range is used. The CPU 110 determines the lightness L * _cal of the corrected character color according to the lightness L * _bak of the background color.
(A) When L * _bak ≧ 50 The CPU 110 determines the lightness L * _cal according to the following equation (1).
L * _cal = L * _bak− ΔL * (1)
Note that if the calculation result of the expression (1) is a negative value, that is, if the calculation result is smaller than the minimum value that the brightness can take, the CPU 110 may correct L * _cal = 0 again. Good.
(B) When L * _bak <50 The CPU 110 determines the lightness L * _cal according to the following equation (2).
L * _cal = L * _bak + ΔL * (2)
When the calculation result of Expression (2) exceeds 100, that is, when the calculation result is larger than the maximum value that the lightness can take, the CPU 110 may perform correction again with L * _cal = 0.

  FIG. 6 is a diagram illustrating an example in which the character color candidates in FIG. 5 are corrected. When expressed in the L * a * b * color system, only the lightness L * component is corrected. By this correction, the difference in brightness between the background color and the character color (contrast) in the text is equal to the difference in brightness in the image.

  A description will be given with reference to FIG. 3 again. In step S130, CPU 110 determines a character color and a background color. CPU 110 outputs the document according to the determined character color and background color. When there are a plurality of character color candidates, the CPU 110 determines one of them as the character color. A method for selecting which of the candidate colors is determined as the character color is arbitrary. For example, the CPU 110 may determine one of the candidate colors as a character color in response to a user operation input. Or CPU110 may select a character color at random from candidate colors. Alternatively, the CPU 110 selects, from among the candidate colors, a color that satisfies a predetermined relationship with a representative color of the image (for example, an average color of the image or a frequent color, that is, a color having the largest number of pixels) as a character color. May be. CPU 110 outputs a document whose character color and background color are determined. For example, the CPU 110 displays an image on the display 170 according to the document data. Alternatively, CPU 110 stores document data in HDD 150. Or CPU110 outputs document data to another apparatus via a network or I / F140.

  As described above, according to the present embodiment, the visual impression due to the contrast of the image is maintained even in the text region, so that the entire document can be given a unified impression.

3. Other Embodiments The present invention is not limited to the above-described embodiments, and various modifications can be made.
In the above-described embodiment, the example in which the target document includes one image has been described. However, the target document may include a plurality of images. In this case, the CPU 110 may select one of the plurality of images as the target image. For example, the CPU 110 may select an image having a minimum distance from the text among the plurality of images as the target image. Or CPU110 may select an image with the largest area among several images as a target image. Further alternatively, the CPU 110 may select a target image based on image attribute information. In this case, the document includes attribute information indicating the attribute of each object. Further alternatively, the CPU 110 may select the target image in response to a user instruction input.

  In the above-described embodiment, the example of changing the character color between the character color and the background color has been described, but the color to be changed is not limited to the character color. The CPU 110 may change the background color based on the brightness difference between pixels. Or CPU110 may change a background color about the part by which the calculation result by Formula (1) or Formula (2) exceeded the maximum value or minimum value of the brightness about the character color. Further alternatively, the CPU 110 may assign a lightness difference between pixels to the character color and the background color at a certain ratio, and change both the character color and the background color. Further alternatively, it may be determined according to the user's instruction input whether to change the character color or the background color.

  In the above-described embodiment, the character color is selected from the four candidate colors, but the number of candidate colors is not limited to four. The number of candidate colors may be 3 or less, or 5 or more. In particular, the number of candidate colors may be one. That is, the character color may be determined directly.

  In the above embodiment, the character color or the background color is processed using the L * a * b * color system, but the color system used is not limited to this. Any color system may be used as long as the lightness can be changed.

  In the above-described embodiment, the example in which the document includes one page of information has been described. However, the document may include multiple pages of information. In this case, the CPU 110 may perform the above processing on images and text included in the same page, or may perform the above processing on images and text included in a plurality of pages.

  Further, the program that causes the computer apparatus to execute the above-described processing may be provided by a storage medium such as a CD-ROM (Compact Disk Read Only Memory).

It is a figure which shows the function structure of the document editing apparatus 100 which concerns on one Embodiment of this invention. 2 is a diagram illustrating a hardware configuration of a document editing apparatus 100. FIG. 3 is a flowchart showing the operation of the document editing apparatus 100. It is a figure which illustrates an object document. It is a figure which illustrates the candidate of a character color. It is a figure which shows the example which correct | amended with respect to the character color candidate.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 ... Document editing apparatus 101 ... Lightness difference detection part 102 ... Initial value acquisition part 103 ... Color change part 110 ... CPU, 120 ... ROM, 130 ... RAM, 140 ... I / F, 150 ... HDD, 160 ... Keyboard / Mouse, 170 ... Display, 180 ... Network IF, 190 ... Bus

Claims (7)

Detecting means for detecting a lightness difference between pixels of the image in a document including an image and text;
Obtaining means for obtaining initial values of brightness of the background color and the character color of the text;
A changing unit that changes at least one of a background color and a character color of the text from the initial value of the brightness acquired by the acquiring unit according to the brightness difference between the pixels detected by the detecting unit; Document editing device having. The document includes a plurality of images;
The document editing apparatus according to claim 1, wherein the detection unit detects a lightness difference between pixels in an image having a minimum distance from the text among the plurality of images. The document includes a plurality of images;
The document editing apparatus according to claim 1, wherein the detection unit detects a brightness difference between pixels in an image having the largest area among the plurality of images. The changing means changes the lightness of at least one of the background color and the character color of the text so that the lightness difference between the text, the background color, and the character color is equal to the lightness difference between the pixels. The document editing apparatus according to claim 1. The document editing apparatus according to claim 1, wherein the changing unit changes a lightness of a background color and a character color of the text. Computer equipment,
Detecting a brightness difference between pixels of the image in a document including the image and text;
Obtaining initial values of brightness of the background color and text color of the text;
A program for executing at least one of a background color and a character color of the text from the acquired initial value of brightness according to the detected brightness difference between pixels. Computer equipment,
Detecting a brightness difference between pixels of the image in a document including the image and text;
Obtaining initial values of brightness of the background color and text color of the text;
A storage medium storing a program for executing a step of changing at least one of a background color and a character color of the text from the initial value of the acquired brightness according to the detected brightness difference between pixels.

Images